Simply indispensable 1 1

While we cross without knowing one of the worst periods for the seat of our back, and just to be convinced to watch most often too low chairs and always slightly tilted backwards (while c 'Just the opposite should be) giving a false impression of comfort because in reality your pelvis and back collapse, the ball cushion is the ideal remedy to bad postures and (bad) prolonged sitting.
The first sensation is strange because it forces to find its balance. Keep your back straight. But it is this that will encourage dynamic sitting posture and solicit the back muscles that no longer have (if any) used to work. For my part, I felt some pain (quite benign) after several hours of use. This is normal because some of my muscles never usually have "woken up".
After a few days it becomes very difficult to do without this cushion. For proof, it is sufficient to remove it and to see how the seat "slumped" Previous becomes a real ordeal.